Low Current Consumption Read Mode - Renesas M16C/64A Series User Manual

M16C/64A Group
9.4.2.2

Low Current Consumption Read Mode

Low current consumption read mode can be used when the CM07 bit in the CM0 register is 1 (sub
clock used as CPU clock).Figure 9.5 shows Setting and Canceling Low Current Consumption Read
Mode.
Note:
1. Do not rewrite bits FMR22 and FMR23 simultaneously.
Figure 9.5 Setting and Canceling Low Current Consumption Read Mode
R01UH0136EJ0210 Rev.2.10
Jul 31, 2012
Low current consumption read mode
Set the CM07 bit to 1 (sub clock used as a CPU clock)
Set the CM05 bit to 1 (main clock oscillator stop)
Set the FMR22 bit to 0
and then to 1 (slow read mode enabled)
Set the FMR23 bit to 0 and then to 1
(low current consumption read mode enabled)
Processing in low current consumption read mode
Set the FMR23 bit to 0
Set the FMR22 bit to 0
Completed
Setting
procedure
(1)
(1)
(1)
(1)
9. Power Control
Canceling
procedure
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